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Author(s):
S. Morita et al.
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Title:
Characteristic Features of Edge Localized Mode under the Presence of Edge Ergodic Magnetic Field Layer in LHD
Date of publication:
Oct. 2006
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Key words:
21 IAEA Fusion Energy Conference , EX/P8-4
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Abstract:
Existence of the ergodic magnetic field layer surrounding the core plasma argues one of typical characters in Large Helical Device (LHD). A new type of H-mode-like discharges have been obtained at an outwardly shifted configuration of R_ax=4.00m with extremely thick ergodic layer, where the iota/2pi=1 position is located in the middle of the ergodic layer. These H-mode-like discharges can be triggered by changing P_NBI (<12MW) from 3 beams to 2 beams in a density range of 4-8x10^13 cm^-3, although the spontaneous transition is also observed. ELM-like bursts appeared with a radial propagation of density bursts are occurred at the iota/2pi =1position and are mainly excited at the inboard side of the torus. The frequency of the ELM-like bursts increases with heating power, at which the edge pressure profile is steeper. ELM-like bursts in LHD are briefly interpreted.
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